Refine qemu gdb stub.

qemu_gdb/Makefile

@@ -31,12 +31,5 @@ clean:
 qemu: kernel
 	qemu-system-riscv64 -machine virt -smp 1 -bios none -kernel $(TEST_OBJ) -nographic -s -S
 
-
-# gdb: kernel
-# 	gdb-multiarch                         \
-# 		-ex "file $(TEST_OBJ)"              \
-# 		-ex "set debug remote 1"            \
-# 		-ex "target remote localhost:1234" \
-
 gdb: kernel
-	gdb-multiarch $(TEST_OBJ) -ex "target remote localhost:1234"
+	gdb-multiarch -x rv.gdb

qemu_gdb/rv.gdb

@@ -0,0 +1,6 @@
+
+
+file ./build/kernel.elf
+set architecture riscv:rv64
+target remote localhost:1234
+set $pc = 0x80000000